Egypt — nile borders (1): SudanEgyptSudan — nile borders (6): Central African Republic, Chad, Egypt, Eritrea, Ethiopia, South SudanSudanSouth Sudan — nile borders (6): Central African Republic, DR Congo, Ethiopia, Kenya, Sudan, UgandaSouth SudanEthiopia — nile borders (6): Djibouti, Eritrea, Kenya, Somalia, South Sudan, SudanEthiopiaEritrea — nile borders (3): Djibouti, Ethiopia, SudanEritreaMauritania — sahel borders (2): Mali, SenegalMauritaniaMali — sahel borders (6): Burkina Faso, Guinea, Ivory Coast, Mauritania, Niger, SenegalMaliNiger — sahel borders (5): Benin, Burkina Faso, Chad, Mali, NigeriaNigerChad — sahel borders (5): Cameroon, Central African Republic, Niger, Nigeria, SudanChadBurkina Faso — sahel borders (6): Benin, Ghana, Ivory Coast, Mali, Niger, TogoBurkina FasoSenegal — guinea_coast borders (3): Guinea, Mali, MauritaniaSenegalGuinea — guinea_coast borders (5): Ivory Coast, Liberia, Mali, Senegal, Sierra LeoneGuineaSierra Leone — guinea_coast borders (2): Guinea, LiberiaSierra LeoneLiberia — guinea_coast borders (3): Guinea, Ivory Coast, Sierra LeoneLiberiaIvory Coast — guinea_coast borders (5): Burkina Faso, Ghana, Guinea, Liberia, MaliIvory CoastGhana — guinea_coast borders (3): Burkina Faso, Ivory Coast, TogoGhanaTogo — niger_delta borders (3): Benin, Burkina Faso, GhanaTogoBenin — niger_delta borders (4): Burkina Faso, Niger, Nigeria, TogoBeninNigeria — niger_delta borders (4): Benin, Cameroon, Chad, NigerNigeriaCameroon — niger_delta borders (6): Central African Republic, Chad, Congo, Equatorial Guinea, Gabon, NigeriaCameroonDjibouti — horn borders (3): Eritrea, Ethiopia, SomaliaDjiboutiSomalia — horn borders (3): Djibouti, Ethiopia, KenyaSomaliaKenya — horn borders (4): Ethiopia, Somalia, South Sudan, UgandaKenyaUganda — horn borders (3): DR Congo, Kenya, South SudanUgandaCentral African Republic — congo_basin borders (6): Cameroon, Chad, Congo, DR Congo, South Sudan, SudanCentral African RepublicDR Congo — congo_basin borders (5): Angola, Central African Republic, Congo, South Sudan, UgandaDR CongoCongo — congo_basin borders (5): Angola, Cameroon, Central African Republic, DR Congo, GabonCongoGabon — congo_basin borders (3): Cameroon, Congo, Equatorial GuineaGabonEquatorial Guinea — congo_basin borders (2): Cameroon, GabonEquatorial GuineaAngola — congo_basin borders (2): Congo, DR CongoAngola